The general form or mode of growth (especially of a plant or crystal) WordNet 3.0 & Open English WordNet

Habit, equivalent to habitus in some applications in biology, refers variously to aspects of behaviour or structure, as follows: In zoology, habit usually refers to aspects of more or less predictable behaviour, instinctive or otherwise, though it also has broader application. Wikipedia

Aspects of behaviour or structure Wikipedia Disambiguation

Form of growth or general appearance of a variety or species of plant or crystal. Wiktionary